Dipole Field Navigation for Deep Tissue Targeting
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Solution Overview
Problem
Current magnetic navigation methods for therapeutic agents in the body, such as Magnetic Resonance Navigation (MRN) and Electromagnetic Actuation Magnetic Navigation Systems (EMA-MNS), face limitations in achieving high magnetic field strength and directional gradients necessary for effective navigation in deep tissues, leading to suboptimal targeting and increased side effects due to systemic administration of chemotherapeutics.
Innovation Solution
Dipole Field Navigation (DFN) uses ferromagnetic cores placed inside an MRI scanner to distort the uniform magnetic field, generating high directional gradients exceeding 300 mT/m, allowing therapeutic agents with magnetic nanoparticles to follow a desired path in the vascular network, overcoming constraints like peripheral nerve stimulation and high implementation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If Magnetic Resonance Navigation (MRN) or Electromagnetic Actuation Magnetic Navigation Systems (EMA-MNS) are used for therapeutic agent navigation, then navigation capability in deep tissues is achieved, but magnetic field strength and directional gradients are insufficient leading to suboptimal targeting
Solution Approach 1:
The system segments the magnetic field generation function by using multiple independently controllable magnetic coils arranged in arrays, allowing each coil to contribute to specific regions of the magnetic field, thereby achieving both high field strength and precise spatial control for deep tissue navigation
Solution Approach 2:
The system dynamically adjusts magnetic field parameters including gradient strength, field orientation, and temporal variation to optimize both the force exerted on therapeutic agents and the precision of targeting, enabling adaptation to different navigation depths and requirements
2Productivity
If high magnetic field strength and directional gradients are increased for effective navigation, then navigation effectiveness improves, but peripheral nerve stimulation and other harmful effects increase
Solution Approach 1:
The system applies magnetic field gradients locally and selectively to specific regions where therapeutic agents are needed, rather than applying uniform high gradients throughout the body, thereby achieving effective navigation while minimizing exposure of surrounding healthy tissues to harmful high gradient effects
Solution Approach 2:
The system uses periodic or pulsed magnetic field variations instead of continuous high gradients, allowing sufficient time for therapeutic agents to respond to directional forces while reducing the risk of peripheral nerve stimulation that occurs with sustained high gradient exposure
3Manufacturing precision
If complex coil-based systems are used to generate high directional gradients, then navigation precision improves, but device complexity and implementation costs increase
Solution Approach 1:
The magnetic coil arrays are designed to perform multiple functions including generating navigational gradients, providing imaging fields for MRI guidance, and enabling whole-body interventions, thereby reducing the need for separate specialized systems and lowering overall implementation complexity and cost
Solution Approach 2:
The system utilizes the existing MRI scanner infrastructure and its built-in gradient coils to generate the necessary magnetic fields for navigation, eliminating the need for entirely separate navigation hardware and reducing overall system complexity while maintaining high targeting precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
DFN enables precise and efficient navigation of therapeutic agents to targeted regions with high magnetic gradients, reducing side effects and improving delivery efficiency, while being adaptable for whole-body interventions and reducing costs compared to complex coil-based systems.
Implementation Method 1
Dipole Field Navigation (DFN) uses ferromagnetic cores placed inside an MRI scanner to distort the uniform magnetic field, generating high directional gradients exceeding 300 mT/m
Implementation Method 2
Dipole Field Navigation (DFN) uses ferromagnetic cores placed inside an MRI scanner to distort the uniform magnetic field
Implementation Method 3
generating high directional gradients exceeding 300 mT/m, allowing therapeutic agents with magnetic nanoparticles to follow a desired path
Implementation Method 4
The MNPs, are typically superparamagnetic nanoparticles which makes them highly magnetizable when subject to a magnetic field
Implementation Method 5
The magnetization of the superparamagnetic nanoparticles increases up to a saturation magnetization value when submitted to an increasing magnetic field strength
Implementation Method 6
The magnetization of the superparamagnetic nanoparticles increases up to a saturation magnetization value when submitted to an increasing magnetic field strength, and the magnetization is lost when the superparamagnetic particles are removed from the magnetic field. Such a magnetic property allows the use of magnetic gradients to induce directional (pushing/pulling) forces for superparamagnetic particle navigation purposes
Data Source
AI summary
A method for navigating therapeutic, diagnostic or imaging agents in a vascular network or body cavity is introduced. The method is characterized by high directional gradients and a high magnetic field strength. The latter is used to saturate the magnetization of magnetic therapeutic agents such that when combined with high directional gradients, improved navigation of the magnetic therapeutic agents can be provided at various depths within a patient's body.